fixed double border for debugger tab panel

editor/editor_node.cpp

@@ -4033,7 +4033,6 @@ void EditorNode::_bottom_panel_switch(bool p_enable, int p_idx) {
 			bottom_panel_items[i].button->set_pressed(i == p_idx);
 			bottom_panel_items[i].control->set_visible(i == p_idx);
 		}
-		// ScriptEditor::get_singleton()->get_debugger() == bottom_panel_items[i].control
 		if (ScriptEditor::get_singleton()->get_debugger() == bottom_panel_items[p_idx].control) { // this is the debug panel wich uses tabs, so the top section should be smaller
 			Ref<StyleBoxFlat> style_panel_invisible_top = gui_base->get_stylebox("panel", "TabContainer")->duplicate();
 			int stylebox_offset = gui_base->get_font("font", "Tabs")->get_height() + gui_base->get_stylebox("tab_fg", "Tabs")->get_minimum_size().height + gui_base->get_stylebox("panel", "TabContainer")->get_default_margin(MARGIN_TOP);

editor/script_editor_debugger.cpp

@@ -1622,8 +1622,9 @@ ScriptEditorDebugger::ScriptEditorDebugger(EditorNode *p_editor) {
 	tabs->add_style_override("panel", editor->get_gui_base()->get_stylebox("DebuggerPanel", "EditorStyles"));
 	tabs->add_style_override("tab_fg", editor->get_gui_base()->get_stylebox("DebuggerTabFG", "EditorStyles"));
 	tabs->add_style_override("tab_bg", editor->get_gui_base()->get_stylebox("DebuggerTabBG", "EditorStyles"));
-	tabs->set_v_size_flags(SIZE_EXPAND_FILL);
 	tabs->set_area_as_parent_rect();
+	tabs->set_margin(MARGIN_LEFT, -EditorNode::get_singleton()->get_gui_base()->get_stylebox("panel", "TabContainer")->get_margin(MARGIN_LEFT));
+	tabs->set_margin(MARGIN_RIGHT, EditorNode::get_singleton()->get_gui_base()->get_stylebox("panel", "TabContainer")->get_margin(MARGIN_LEFT));
 	add_child(tabs);
 
 	{ //debugger